We maintain a website dedicated to connecting families whose spelling varies, as yours may have. To find about Michael's ancestry, please visit: http://www.geocities.com/Heartland/Trail/1936/http://www.geocities.com/Heartland/Trail/1936/
and look up Valentine Keffer.His ancestry is there, going back to Europe, but no sources are listed.
You'll find that the family was in what became the US, before the revolution. They were loyalists that moved to Canada after the revolution.Some, quite obviously, later moved back.